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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 49 |
| 4 | 252 |
| 5 | 1127 |
| 6 | 4977 |
| 7 | 22736 |
| 8 | 105813 |
| 9 | 491533 |
| 10 | 2269938 |
| 11 | 10462235 |
| 12 | 48259083 |
| 13 | 222798408 |
| 14 | 1028746629 |
| 15 | 4749274209 |
| 16 | 21922813539 |
| 17 | 101196577809 |
| 18 | 467142348798 |
| 19 | 2156444661242 |
| 20 | 9954648966159 |
| 21 | 45952741121083 |
| 22 | 212127214776309 |
[1,7,49,252,1127,4977,22736,105813,491533,2269938, 10462235,48259083,222798408,1028746629,4749274209, 21922813539,101196577809,467142348798, 2156444661242,9954648966159,45952741121083, 212127214776309] |